KR20220114483A - Battery pack - Google Patents

Abstract

Provided is a battery pack that can appropriately maintain battery performance. The battery pack comprises: a laminate (2) in which a plurality of unit cells (10) are laminated in lamination direction X; and a housing (3) in which the laminate is accommodated. On an inner wall of the housing (3), a heat dissipation member (4) having insulating and heat conducting properties is disposed in a state of making contact with the inner wall of the corresponding housing. Between the unit cells (10) adjacent to each other in the lamination direction X, provided is a positive-negative electrode terminal bonding part (16) where a positive electrode terminal (12) of one of the adjacent unit cells and a negative electrode terminal (14) of the other one of the unit cells are bonded to each other. The corresponding positive-negative electrode terminal bonding part is in contact with the heat dissipation member (4).

Description

battery pack {BATTERY PACK}

The present invention relates to an assembled battery.

An assembled battery including a secondary battery such as a lithium ion secondary battery or a nickel hydride battery or a power storage element such as a capacitor as a single cell, and including a plurality of the single cells, is increasingly important as a power source for in-vehicle power sources or power sources for personal computers and portable terminals. In particular, an assembled battery in which a lithium ion secondary battery, which is lightweight and has a high energy density, is used as a single cell is preferably used for a high-output power source for in-vehicle use or the like.

Such an assembled battery typically includes a stack in which a plurality of unit cells are stacked in a predetermined stacking direction, and a housing accommodating the stack, and adjacent unit cells in the stacking direction connect electrode terminals to each other. It is constructed by being electrically connected through For example, the following Patent Documents 1 and 2 disclose an assembled battery having such a configuration.

Japanese Patent Application Publication No. 2019-508846 Japanese Patent Application Laid-Open No. 2013-164975

By the way, in assembled batteries used as in-vehicle power sources and the like, so-called high-rate charging and discharging of charging and discharging with a large current in a short time is often performed. And it is known that, according to such a high-rate charging/discharging, power concentration occurs in an electrode terminal etc., and the temperature of an electrode body rises easily. As the temperature of the electrode body rises in this way, there is a risk that the performance of the assembled battery is lowered, which is not preferable.

The present invention has been made in view of such circumstances, and its main object is to provide an assembled battery in which battery performance can be appropriately maintained. Further, for example, Patent Document 1 describes arranging the heat generated from the electrode body in the order of a packaging material for accommodating the electrode body, a thermally conductive adhesive, and a housing, but directly from the electrode terminal. There is no disclosure of the technology for taking heat from the furnace.

In order to achieve this object, the present invention provides an assembled battery comprising a stack in which a plurality of unit cells are stacked along a predetermined stacking direction, and a housing for accommodating the stack.

The unit cell includes an electrode body including a first electrode of either positive or negative electrode and a second electrode that is a counter electrode of the first electrode, and an exterior body for accommodating the electrode body. A first electrode terminal and a second electrode terminal electrically connected to the first electrode and the second electrode, respectively, are disposed outside the exterior body, and a heat dissipation member having insulation and thermal conductivity on an inner wall of the housing is disposed in contact with the inner wall of the housing. Here, between adjacent unit cells in the stacking direction, between the first electrode terminal and the second electrode terminal of one unit cell, and the first electrode terminal and the second electrode terminal of the other unit cell The electrode terminal junction part to which any was joined exists, and this electrode terminal junction part is in contact with the said heat dissipation member.

In the assembled battery having such a configuration, heat generated from the electrode terminal junction where power concentration tends to occur can be efficiently arranged through the heat dissipation member and the housing. Thereby, since the temperature rise of an electrode body can be suppressed suitably, battery performance can be maintained suitably. Further, since the resonant frequency of the electrode terminal junction is increased when the electrode terminal junction is physically in contact with the housing through the heat dissipation member, an assembled battery having high vibration resistance can be obtained.

In a preferred embodiment of the assembled battery disclosed herein, the exterior body includes a pair of rectangular wide surfaces, and the first electrode terminal is disposed on one short side or long side of the wide surface, and the second electrode terminal is disposed on the side opposite to the one short side or the long side.

In the assembled battery provided with the single cell of such a structure, since heat generated from the electrode terminal junction can be efficiently arranged from both sides of the housing, it is preferable.

In a preferred aspect of the assembled battery disclosed herein, the heat dissipation member includes a resin matrix having insulation and a filler member having thermal conductivity. Since the heat dissipation member having such a configuration is excellent in thermal conductivity, heat generated from the electrode terminal junction can be more efficiently arranged through the heat dissipation member and the housing. In addition, it is preferable that the resin matrix contains a silicone resin and the filler member contains alumina.

In a preferred embodiment of the assembled battery disclosed herein, the housing is made of aluminum or an alloy composed mainly of aluminum.

Since the housing made of aluminum or an alloy mainly composed of aluminum is excellent in heat dissipation, heat generated from the electrode terminal junction can be more efficiently arranged through the housing.

In a preferred aspect of the assembled battery disclosed herein, a heat exchanger is provided outside the inner wall of the housing on which the heat dissipation member is disposed.

According to such a structure, the heat|fever generated from the electrode terminal junction part can be arranged more efficiently through a heat radiation member, a housing, and a heat exchanger.

In one preferred embodiment of the assembled battery disclosed herein, the outer body is made of a laminate film.

When the exterior body is made of a laminate film, the first electrode terminal and the second electrode terminal are typically welded to the laminate film via a welding film made of a resin material or the like. Such a welded portion may be unsealed under the influence of heat generated from the electrode terminal junction portion. Therefore, an exterior body including a laminate film is suitable as an object to which this technique is applied.

BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic diagram for demonstrating the main structure of the assembled battery which concerns on one Embodiment.
FIG. 2 is a plan view schematically showing the configuration of a single cell included in the assembled battery of FIG. 1 .
FIG. 3 is a schematic diagram for explaining the configuration of a laminate included in the assembled battery of FIG. 1 .
4 is a schematic diagram for explaining the main configuration of an assembled battery according to a modified example.

Hereinafter, a preferred embodiment of the assembled battery disclosed herein will be described in detail with reference to the drawings as appropriate. Matters other than those specifically mentioned in this specification and necessary for implementation can be grasped as design matters by those skilled in the art based on the prior art in this field. The present invention can be implemented based on the content disclosed in this specification and common technical knowledge in this field. In addition, the following embodiment is not intended to limit the technique disclosed herein. In addition, in the drawings shown in this specification, the same code|symbol is attached|subjected to the member and site|part which exhibits the same action, and it demonstrates. In addition, the dimensional relationship (length, width, thickness, etc.) in each drawing does not reflect an actual dimensional relationship.

In this specification, a "battery" is a term indicating a general electrical storage device capable of extracting electric energy, and is a concept including a primary battery and a secondary battery. A "secondary battery" refers to the general power storage device that can be repeatedly charged and discharged.

1 is a schematic diagram for explaining the main configuration of an assembled battery 1 according to an embodiment. As shown in FIG. 1 , the assembled battery 1 according to the present embodiment, roughly speaking, includes a laminate 2 , a housing 3 accommodating the laminate, a heat dissipation member 4 , and heat exchange. A device (5) is provided. Hereinafter, each component will be described in detail. Incidentally, in the following description, an embodiment in which the unit cells 10 are connected in series will be described, but it is not intended to be limited thereto. The technique disclosed herein can be applied even when the unit cells 10 are connected in parallel.

<Laminate (2)>

As shown in FIG. 1 , the stacked body 2 according to the present embodiment has a configuration in which a plurality (here, eight) of the unit cells 10 are stacked along the stacking direction X. As shown in FIG. First, the unit cell 10 constituting the laminate 2 will be described with reference to FIG. 2 . In the following, a case will be described in which the exterior body 18 included in the unit cell 10 is made of a laminate film and the electrode body 20 is a laminated electrode body. It was not intended to The technique disclosed herein is applicable also to a case where the exterior body is a metal battery case having a hexahedral box shape, for example. In addition, the technique disclosed herein is applicable also to the case where the electrode body is a wound electrode body etc. which are shape|molded in flat shape by winding the positive electrode sheet and the negative electrode sheet|seat through a separator, for example.

FIG. 2 is a plan view schematically showing the unit cell 10 included in the assembled battery 1 . As shown in FIG. 2 , the unit cell 10 includes an electrode body 20 and an exterior body 18 accommodating the electrode body in general terms. By disposing the electrode body 20 between a pair of laminate films and welding the outer periphery of the laminate film to form a welded portion (not shown), an exterior body 18 for accommodating the electrode body is formed.

Although detailed illustration is omitted, in the electrode body 20 according to the present embodiment, the rectangular positive electrode sheet (ie, positive electrode) and negative electrode sheet (ie, negative electrode) (hereinafter, collectively referred to as “electrode sheet”) are the same. It is formed by laminating a plurality of them through a rectangular separator. Such an electrode sheet includes a current collector (ie, a positive electrode current collector, a negative electrode current collector) that is a thin metal member, and an electrode active material layer (ie, a positive electrode active material layer, a negative electrode active material layer) formed on the surface (single or both surfaces) of the current collector. ) is provided.

In the rectangular electrode sheet according to the present embodiment, an electrode active material layer is not formed on one side edge portion in the long side direction, and an active material layer non-formed portion exposed by the current collector (a positive electrode active material layer non-formed portion, a negative electrode active material non-layered portion) is formed. Then, the electrode body 20 is formed by overlapping each electrode sheet so that the positive electrode active material layer non-formation portion protrudes from one side edge and the negative electrode active material layer non-formation portion protrudes from the other side edge portion. do. Further, in the central portion in the longitudinal direction of the electrode body, a core portion in which the electrode active material layers of the electrode sheet are overlapped is formed. On one side edge in the long side direction, a positive electrode terminal connecting portion in which a plurality of layers of portions without a positive electrode active material layer are overlapped, and a negative terminal connection portion in which a plurality of layers of portions without a negative electrode active material layer are overlapped on the other side edge. And the positive electrode terminal 12 is connected to the positive electrode terminal connection part, and the negative electrode terminal 14 is connected to the negative electrode terminal connection part.

The unit cell 10 included in the assembled battery 1 according to the present embodiment may be a secondary battery such as a fuel cell, an electric double layer capacitor, a lithium ion secondary battery, a nickel hydrogen secondary battery, or a sodium ion secondary battery. When the unit cell 10 is a secondary battery, the unit cell may be, for example, a non-aqueous electrolyte secondary battery or an all-solid-state battery. In the case of a nonaqueous electrolyte secondary battery, the electrode body 20 in which an insulating separator is inserted between electrode sheets is used, and the nonaqueous electrolyte solution is accommodated in the exterior body 18 . On the other hand, in the case of an all-solid-state battery, the electrode body 20 in which the solid electrolyte layer (corresponding to a separator) was inserted between electrode sheets is used. In addition, as the member constituting the battery (specifically, an electrode sheet, a separator, an electrode terminal, a solid electrolyte layer, a non-aqueous electrolyte, etc.), those that can be used in this type of secondary battery can be used without particular limitation. In addition, the unit cell 10 can be manufactured based on a conventionally well-known manufacturing method of a battery.

1 and 3 , in the laminate 2 according to the present embodiment, the arrangement position of the positive electrode terminal 12 and the negative electrode terminal 14 in the unit cell 10 is in the stacking direction X They are arranged to alternately reverse along the Then, between the adjacent unit cells 10 in the stacking direction X, portions of the positive electrode terminal 12 of one unit cell 10 and the negative electrode terminal 14 of the other unit cell 10 are respectively bent. In this state, the positive and negative terminal junctions 16 joined are present. As a bonding method of the positive electrode terminal 12 and the negative electrode terminal 14, a conventionally well-known method used for bonding of an electrode terminal can be used without limitation in particular, For example, laser welding, resistance welding, etc. are mentioned. In addition, although detailed illustration is abbreviate|omitted, in a part of the positive electrode terminal 12a in the unit cell 10 which exists at the uppermost side in the lamination direction X, and the unit cell 10 which exists at the most downstream side of the lamination direction, A part of the negative electrode terminal 14a is drawn out of the housing 3 and connected externally.

<Housing (3)>

As shown in FIG. 1 , the housing 3 according to the present embodiment is a container having a hexahedral box shape that accommodates the laminate 2 . The housing 3 has a size that can accommodate at least the stacked body 2 . As a method of constructing the housing 3, for example, a method of inserting the laminated body into a rectangular container having an opening for inserting the laminated body 2, then overlapping and sealing the opening with a lid, etc. can be heard Such sealing can be performed, for example, by laser welding or resin-metal bonding with resin.

The material constituting the housing 3 is not particularly limited as long as the effect of the technology disclosed herein is exhibited, but for example, aluminum, an alloy mainly composed of aluminum, iron-aluminum (Fe-Al) alloy, stainless steel Steel, nickel-plated steel, etc. are mentioned. Among these, from the viewpoint of being lightweight and excellent in heat dissipation, aluminum or an alloy mainly composed of aluminum can be preferably used. Here, the aluminum may include various metal elements or non-metal elements as unavoidable impurities. And, in this case, the purity of aluminum (that is, the content of the aluminum component in aluminum) is preferably 95% or more, 97% or more, 99% or more (for example, about 99.5% or 99.8%). have. In addition, the "alloy containing aluminum as a main body" means that, among the components constituting the alloy, the component that is included the most on a weight basis is aluminum. Such an alloy may preferably contain 90% by weight or more, 95% by weight or more, or 99% by weight or more of aluminum. Moreover, as a component other than aluminum, copper (Cu), magnesium (Mg), manganese (Mn), silicon (Si), zinc (Zn), other various metal components, etc. are mentioned, for example.

<The heat dissipation member (4)>

As shown in FIG. 1 , the heat dissipation member 4 according to the present embodiment is disposed in a state in contact with the entire surfaces of the two inner walls of the housing 3 . In addition, the heat radiation member 4 which concerns on this embodiment is a sheet shape of a rectangular type. By disposing the positive electrode terminal junction portion 16 (in this embodiment, the positive electrode terminal 12a and the negative electrode terminal 14a) so as to be in contact with the heat dissipating member 4 arranged in this way, heat generated from the electrode terminal is transferred to the heat dissipating member (4), it can be arranged efficiently through the housing (3). In addition to these effects, since the positive electrode terminal junction portion 16 (in this embodiment, the positive electrode terminal 12a and the negative electrode terminal 14a) is in physical contact with the housing 3 through the heat dissipation member 4, Since each resonance frequency is increased, the vibration resistance of the assembled battery 1 can be improved.

The heat dissipation member 4 is a member which has insulation and has thermal conductivity. Here, the "having insulation" means that it has a property of hardly passing electricity, for example, the volume resistivity measured based on JISK6911: 2006 is typically 1.0×10 ¹⁰ Ω·cm or more, preferably It may represent 1.0×10 ¹² Ω·cm or more, but is not limited thereto.

In addition, the thermal conductivity of the heat dissipation member 4 is, for example, the thermal conductivity measured based on JISA1412-1:2016 is typically 0.5 W/m·K or more, preferably 1.5 W/m·K or more, more Preferably it may be 3.0 W/m·K or more, but is not limited thereto.

The material constituting the heat dissipation member 4 is not particularly limited as long as the effect of the technology disclosed herein is exhibited, but for example, a resin such as a silicone resin, alumina (Al ₂ O ₃ ), or magnesia (MgO) , silica (SiO ₂ ), beryllium (BeO), zirconia (ZrO ₂ ), boron nitride (BN), aluminum nitride (AlN), silicon nitride (Si ₃ N ₄ ), ceramic materials such as boehmite (AlOOH). have. In addition, these can be used individually or in combination of 2 or more types suitably.

Moreover, as a material which comprises the heat radiation member 4, the thing containing the resin matrix which has insulation and the filler member which has thermal conductivity, for example can be used preferably. Examples of the resin matrix include silicone resin, polycarbonate (PC), polybutylene terephthalate (PBT), polyamide (PA), polyamideimide (PAI), polyimide (PI), and polyvinyl chloride. (PVC), polyurethane (PU), polyether sulfone resin (PES), acrylonitrile styrene acrylate resin (ASA), polyphenylene sulfide (PPS), polyether ether ketone (PEEK), polypropylene ( PP), polyethylene (PE), polystyrene (PS), polyoxymethylene (POM), acrylic resin (PMMA), ABS resin, phenol resin (PF), epoxy resin (EP), unsaturated polyester, nylon, etc. These are mentioned, These can be used individually or in combination of 2 or more types suitably. Moreover, as said filler member, the ceramic materials etc. which were mentioned above are mentioned, for example, These can be used individually or in combination of 2 or more types suitably. Among these, those containing a silicone resin as a resin matrix and containing alumina as a filler member can be used preferably from a viewpoint of being excellent in thermal conductivity. About the compounding quantity of the said resin matrix and the said filler member, it is preferable to adjust suitably according to the kind of the said resin matrix and the said filler member.

In addition, the thermal conductivity and thickness of the heat dissipation member 4 (here, the distance from the inner wall in contact with the heat dissipation member 4 to the positive and negative electrode terminal junction part 16 is shown), etc. can be suitably determined by performing a preliminary test. In addition, although it is not intended to be particularly limitedly analyzed, for example, when the assembled battery 1 includes eight single cells 10 with a capacity of about 200 × 3.7 Wh, as the heat dissipating member 4 , the volume resistivity This 1.0×10 ¹² Ω·cm or so, a thermal conductivity of about 1.0 W/m·K, and a thickness of the heat dissipating member of about 8.0 mm can be used.

The method of disposing the heat dissipation member 4 on the inner wall of the housing 3 is not particularly limited as long as the effect of the technology disclosed herein is exhibited, but for example, an adhesive is applied to the mounting surface of the heat dissipation member 4 A method of arranging the heat dissipating member 4 by employing and disposing a heat dissipating member 4 having adhesive properties in advance, and applying a heat dissipating member raw material in the form of a paste (including those in the form of ink and slurry) to the desired inner wall of the housing 3, It is made to dry, and the method of forming the heat radiation member 4, etc. are mentioned. Moreover, when providing an adhesive agent to the mounting surface in the heat dissipation member 4, it is preferable to provide to such an extent that heat conduction is not inhibited by the adhesive layer formed.

<Heat exchanger (5)>

As shown in FIG. 1 , the heat exchanger 5 according to the present embodiment is provided outside the housing 3 in which the heat dissipation member 4 is disposed. The type of such a heat exchanger is not particularly limited as long as the effect of the technology disclosed herein is exhibited, but for example, a shell & tube type heat exchanger (shell & tube type heat exchanger; a fine cylindrical tube (tube) in a thick cylindrical tube (shell)) These are arranged in multiple numbers, and heat exchange is performed by flowing fluids of different temperatures inside and outside the tube), plate heat exchangers (metal plates (plates) pressed against irregularities are superimposed on top of each other, and fluids with different temperatures are alternately flowed) heat exchange), a finned tube type heat exchanger (a liquid medium flows in a circular tube (tube), and the gas is brought into contact with the outside of the tube and the fins to perform heat exchange), and various other heat exchangers can be employed. By disposing the heat exchanger 5 in this way, heat generated from the positive electrode terminal junction portion 16 (in this embodiment, the positive electrode terminal 12a and the negative electrode terminal 14a further) can be more effectively arranged, which is preferable.

<Construction method of assembled battery 1>

Subsequently, the method for constructing the assembled battery 1 according to the present embodiment will be described, but it is not intended to limit the method for constructing the assembled battery 1 to the following method. In addition, each step in the following construction method can be replaced suitably and can be implemented.

First, as shown in FIG. 3 , a plurality (here, eight) of the unit cells 10 are prepared and stacked along the stacking direction X. As shown in FIG. Then, between the unit cells 10 adjacent along the stacking direction X, the positive electrode terminal 12 of one unit cell 10 and the negative electrode terminal 14 of the other unit cell 10 are bent. By joining by laser welding in this state, the positive and negative electrode terminal junctions 16 (here, seven locations) are formed. In addition, the positive electrode terminal 12a of the unit cell 10 on the most downstream side in the stacking direction X and the negative electrode terminal 14a of the unit cell 10 on the most upstream side in the stacking direction are for external connection. It is left without performing such bonding.

Then, the box-shaped container provided with the opening part for inserting the laminated body 2 is prepared. And the sheet-like heat dissipation member 4 of a rectangular type is arrange|positioned so that it may contact|connect the whole surface of the two inner walls in such a container. In this embodiment, at the time of such arrangement|positioning, the adhesive agent is apply|coated to the arrangement|positioning surface of the heat dissipation member 4, and it adheres to the inner wall of the said container.

Next, the laminate 2 produced as described above is inserted into the container in which the heat dissipation member 4 is disposed. At the time of such insertion, the seven positive electrode terminal junction portions 16, the positive electrode terminal 12a, and the negative electrode terminal 14a included in the laminate 2 are brought into contact with the heat dissipation member 4 in the container. At this time, a part of the positive electrode terminal 12a and a part of the negative electrode terminal 14a are drawn out from the container in which the heat dissipation member 4 is disposed, respectively, for external connection.

Then, a lid for sealing the opening is superposed on the opening of the container in which the laminate 2 is accommodated, and the periphery of the opening is welded and sealed by laser welding. Finally, by providing the heat exchanger 5 outside the housing 3 where the heat dissipation member 4 is disposed, the assembled battery 1 can be constructed.

<Modified example>

In the above, specific examples of the assembled battery (a method of constructing an assembled battery) disclosed herein have been described in detail with reference to the assembled battery 1, but the assembled battery disclosed herein is not limited to these specific examples. The assembled battery disclosed herein includes various modifications of the above-described specific examples as long as the purpose is not changed. Hereinafter, examples (i) to (v) of the modified example of the assembled battery 1 will be described.

(i) In the said embodiment, although the heat radiation member 4 is arrange|positioned in the state which contacted the whole surface of the two inner walls of the housing 3, it is not limited to this. The heat dissipation member 4 may be provided only in the minimum required part in two inner walls of the housing 3, for example. Moreover, in the said embodiment, although the heat radiation member 4 is arrange|positioned with respect to the positive electrode terminal 12a and the negative electrode terminal 14a in addition to the positive electrode terminal junction part 16, it is not limited to this. For example, in addition to the positive electrode terminal junction portion 16 , the heat dissipation member 4 may be disposed with respect to only one of the positive electrode terminal 12a or the negative electrode terminal 14a. Also, of course, since the effect of the technology disclosed herein can be exhibited at least in an embodiment in which the heat dissipation member 4 is disposed with respect to the positive and negative electrode terminal junction 16 , only the positive and negative electrode terminal junction part The said heat dissipation member may be arrange|positioned (The same applies to following (ii)).

(ii) In the said embodiment, although the heat radiation member 4 is continuously arrange|positioned along the lamination|stacking direction X, it is not limited to this. For example, you may arrange|position the heat radiation member 4 as shown in FIG. In addition, in this case, as long as the effect of the technique disclosed herein is exhibited, you may differ in the size and shape of each heat dissipation member 4 .

(iii) Although the sheet-like heat dissipation member 4 of a rectangular type is used in the said embodiment, it is not limited to this, For example, various shapes, such as a rhombus shape and an ellipse, may be sufficient. In addition, in the said embodiment, although the sheet-like heat radiating member 4 is used, it is not limited to this, For example, block shape etc. may be sufficient.

(iv) In the above embodiment, the case in which the assembled battery 1 is provided with the heat exchanger 5 is described. Of course, the case where the heat exchanger 5 is not provided is also described. The effect of technology can be obtained.

(v) In the above embodiment, the positive electrode terminal 12 is disposed on one short side of the exterior body 18, and the negative electrode terminal 14 is disposed on the side opposite to the one short side. Although the existing unit cell 10 is used, it is not limited to this. For example, the single cell 10 in which the positive electrode terminal 12 and the negative electrode terminal 14 are arrange|positioned on one short side or a long side of the exterior body 18 can be used. In this case, the heat dissipation member 4 may be disposed on the inner wall of one side of the housing 3 .

The assembled battery 1 disclosed herein can be used for various applications. As an example of a suitable use, the power supply for a drive mounted in vehicles, such as an electric vehicle (BEV), a hybrid vehicle (HEV), and a plug-in hybrid vehicle (PHEV), is mentioned. Among them, it can be preferably used particularly in an electric vehicle (BEV).

1: battery pack
2: Laminate
3: housing
4: Heat dissipation member
5: heat exchanger
10: single cell
12, 12a: positive terminal
14, 14a: negative terminal
16: positive and negative terminal junction
18: exterior body
20: electrode body
X: stacking direction

Claims (7)

A laminate in which a plurality of unit cells are stacked along a predetermined stacking direction;
a housing that accommodates the laminate
As an assembled battery,
The unit cell includes an electrode body including a first electrode of either positive or negative electrode and a second electrode that is a counter electrode of the first electrode, and an exterior body for accommodating the electrode body;
A first electrode terminal and a second electrode terminal electrically connected to the first electrode and the second electrode, respectively, are disposed outside the exterior body;
On the inner wall of the housing, a heat dissipation member having insulation and thermal conductivity is disposed in a state in contact with the inner wall of the housing,
Here, between adjacent unit cells in the stacking direction, any of the first electrode terminal and the second electrode terminal of one unit cell and the first electrode terminal and the second electrode terminal of the other unit cell are disposed between adjacent unit cells in the stacking direction. There is an electrode terminal junction part to which one is joined,
The electrode terminal junction portion is in contact with the heat dissipation member. The method of claim 1, wherein the exterior body is provided with a pair of rectangular wide surfaces,
The assembled battery, wherein the first electrode terminal is disposed on one short side or long side of the wide surface, and the second electrode terminal is disposed on a side opposite to the one short side or long side. The assembled battery according to claim 1 or 2, wherein the heat dissipation member includes a resin matrix having insulation and a filler member having thermal conductivity. 4. The assembled battery according to claim 3, wherein the resin matrix comprises a silicone resin and the filler member comprises alumina. The assembled battery according to any one of claims 1 to 4, wherein the housing is made of aluminum or an alloy composed mainly of aluminum. The assembled battery according to any one of claims 1 to 5, wherein a heat exchanger is provided outside an inner wall of the housing on which the heat dissipation member is disposed. The assembled battery according to any one of claims 1 to 6, wherein the exterior body is made of a laminate film.

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